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False positive Tumor marker test

Wafaa 1954

Re: False positive Tumor marker test

MANY thanks Zoe.

I hope who had face same issue to help me.


Community Manager

Re: False positive Tumor marker test

Hi Wafaa 1954,

Thank you for your post.

I am sorry you haven't had any response yet. I am hoping my response will help our members to see your post and share their experience.

In the meantime, for any clinical question, our breast care nurses are here and happy to talk things through.

Sending you our best wishes,


Wafaa 1954

False positive Tumor marker test

Hello All,

I had CA 15-3 & CEA test yesterday and CA15-3 was increased up to 71.9 and my CEA reduced from 14 to 12.3

What i thought is this test is not correct since before two months exactly CA15-3 was 27.3 and on October 2020 was 27.4 and i had PET SCAN on october 2020 and nothing shows only Corona virus which effect my lung slightly.

Also i had Ultrasound on Jan 2021 and everything was good.

I don’t have any symptoms and i’m feeling good.

Shall i repeat the test in another lab ?

I will visit my oncologist by Sunday to double check the matter.

Any comments please ?

Did anyone faced same issue?

Can Tumor markers getting raised suddenly while everything was normal before two months only.